Blogs:
Students who read the same book in lit circles can communicate through blogs.

Podcasts:
Vocabulary
A podcast can be created by the teacher of vocabulary words so students can hear the correct pronunciation.

While You Were Away (for absent students):
A podcast can be created for assignments that may need detailed instruction for students to hear.

Wikis:
Mock Trial for "The Tell-Tale Heart" by Edgar Allan Poe
The defense and prosecution teams could use wikis to show or represent their case. After the trial the jury can post their viewpoint or deliberations.